The FGMP-14 is similar in design and function to the PGMP-13. The FGMP-14 differs only in that it contains the plasma slightly longer until a fusion reaction begins to take place The weapon is somewhat more powerful than a plasma gun, and it may only be used by individuals wearing Battle Dress.

The FGMP-15 incorporates a gravity field generator similar to that used on the PGMP-14 and a weapon system similar to that of the FGMP-14.

The FGMP-16 is an advanced, lighter-weight version of the FGMP-15 with all of its features.

The Fusion Rifle is a highly advanced, very portable version of the earlier FGMP weapons. Fusion rifles are projected to become available somewhere at or beyond TL-17. Such technological guesswork is all conjecture.